MySQL Workbench 错误 1064

Question

大家好！我是 MySQL 的新手。我使用 Workbench 工具创建了一个新模型（我的意思是，我没有自己编写任何代码串）。当尝试正向工程时，我得到：

Executing SQL script in server
ERROR: Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'COMMENT '')
ENGINE = InnoDB' at line 8
SQL Code:
    -- -----------------------------------------------------
    -- Table `university`.`CITY`
    -- -----------------------------------------------------
    CREATE TABLE IF NOT EXISTS `university`.`CITY` (
      `ID_CITY` INT NOT NULL COMMENT '',
      `CNAME` TEXT(15) NULL COMMENT '',
      `POPULATION` INT NULL COMMENT '',
      PRIMARY KEY (`ID_CITY`)  COMMENT '')
    ENGINE = InnoDB

SQL script execution finished: statements: 5 succeeded, 1 failed

 Fetching back view definitions in final form.
 Nothing to fetch

此外，在尝试转发工程师默认 Workbench 模型 "sakila_full" 时，我得到了同样的结果：

Executing SQL script in server
ERROR: Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'COMMENT '',
INDEX `idx_actor_last_name` (`last_name` ASC)  COMMENT '')
ENGINE ' at line 9
SQL Code:
    -- -----------------------------------------------------
    -- Table `sakila`.`actor`
    -- -----------------------------------------------------
    CREATE TABLE IF NOT EXISTS `sakila`.`actor` (
      `actor_id` SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '',
      `first_name` VARCHAR(45) NOT NULL COMMENT '',
      `last_name` VARCHAR(45) NOT NULL COMMENT '',
      `last_update` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '',
      PRIMARY KEY (`actor_id`)  COMMENT '',
      INDEX `idx_actor_last_name` (`last_name` ASC)  COMMENT '')
    ENGINE = InnoDB
    DEFAULT CHARACTER SET = utf8

 SQL script execution finished: statements: 5 succeeded, 1 failed

 Fetching back view definitions in final form.
Could not get definition for sakila.customer_list from server
Could not get definition for sakila.film_list from server
Could not get definition for sakila.nicer_but_slower_film_list from server
Could not get definition for sakila.staff_list from server
Could not get definition for sakila.sales_by_store from server
Could not get definition for sakila.sales_by_film_category from server
Could not get definition for sakila.actor_info from server
7 views were read back.

提前致谢！

Answer 1

看来您对 COMMENT 字符串的理解有点过头了。根据 the MySQL CREATE TABLE syntax，COMMENT 属性只允许在列定义中使用。这意味着它对您在 CREATE 语句末尾列出的 INDEX 或 PRIMARY KEY 定义无效。

COMMENT '' 不是必需的，可以完全省略，尤其是当您将它们留空时。否则，它们将用于您的列定义中的一些额外的人类可读元数据。

要使它与您所拥有的一起使用，请从您的索引和主键定义中删除 COMMENT 属性。

CREATE TABLE IF NOT EXISTS `university`.`CITY` (
  `ID_CITY` INT NOT NULL COMMENT '',
  `CNAME` TEXT(15) NULL COMMENT '',
  `POPULATION` INT NULL COMMENT '',
  -- No COMMENT on PK
  PRIMARY KEY (`ID_CITY`)
) ENGINE = InnoDB;

CREATE TABLE IF NOT EXISTS `sakila`.`actor` (
  `actor_id` SMALLINT UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '',
  `first_name` VARCHAR(45) NOT NULL COMMENT '',
  `last_name` VARCHAR(45) NOT NULL COMMENT '',
  `last_update` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '',
  -- No COMMENT on PK or INDEX
  PRIMARY KEY (`actor_id`),
  INDEX `idx_actor_last_name` (`last_name` ASC)
) ENGINE = InnoDB
  DEFAULT CHARACTER SET = utf8;

或者没有 any 空白的整个事情 COMMENTs:

CREATE TABLE IF NOT EXISTS `university`.`CITY` (
  `ID_CITY` INT NOT NULL COMMENT 'A comment that is not blank!',
  `CNAME` TEXT(15) NULL,
  `POPULATION` INT NULL,
  PRIMARY KEY (`ID_CITY`)
) ENGINE = InnoDB;

（另一个相同table）

MySQL 通常非常擅长通过错误消息直接将您指向语法错误的来源：

check the manual that corresponds to your MySQL server version for the right syntax to use near 'COMMENT ''),

除了在语句末尾出现的错误会变得有点模棱两可外，使用 near 的正确语法会告诉您到底出了什么问题。在上面的例子中，COMMENT '') 应该将您引导到唯一的 COMMENT 属性，后跟 )，这是 PRIMARY KEY 处的属性。从那里，检查手册（上面链接）以了解语句每个部分的合法语法。

Answer 2

嗯，最大的问题是 Mysql Workbench 在使用 "Forward Engineer" 或 "Synchronize Model"

时添加了自己的索引评论，这些评论会产生错误

我用的是6.0版本的时候不存在这个问题

Answer 3

从所有 INDEX 中删除“VISIBLE”和“INVISIBLE”字词

MySQL Workbench 错误 1064

MySQL Workbench Error 1064

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